Pull ec into release branch
[sfrench/cifs-2.6.git] / drivers / acpi / ec.c
1 /*
2  *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
3  *
4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *
8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or (at
13  *  your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  *  General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23  *
24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/delay.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/interrupt.h>
35 #include <asm/io.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
38 #include <acpi/actypes.h>
39
40 #define _COMPONENT              ACPI_EC_COMPONENT
41 ACPI_MODULE_NAME("acpi_ec")
42 #define ACPI_EC_COMPONENT               0x00100000
43 #define ACPI_EC_CLASS                   "embedded_controller"
44 #define ACPI_EC_HID                     "PNP0C09"
45 #define ACPI_EC_DRIVER_NAME             "ACPI Embedded Controller Driver"
46 #define ACPI_EC_DEVICE_NAME             "Embedded Controller"
47 #define ACPI_EC_FILE_INFO               "info"
48 #define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
49 #define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
50 #define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
51 #define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
52 #define ACPI_EC_EVENT_OBF       0x01    /* Output buffer full */
53 #define ACPI_EC_EVENT_IBE       0x02    /* Input buffer empty */
54 #define ACPI_EC_DELAY           50      /* Wait 50ms max. during EC ops */
55 #define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
56 #define ACPI_EC_UDELAY         100      /* Poll @ 100us increments */
57 #define ACPI_EC_UDELAY_COUNT   1000     /* Wait 10ms max. during EC ops */
58 #define ACPI_EC_COMMAND_READ    0x80
59 #define ACPI_EC_COMMAND_WRITE   0x81
60 #define ACPI_EC_BURST_ENABLE    0x82
61 #define ACPI_EC_BURST_DISABLE   0x83
62 #define ACPI_EC_COMMAND_QUERY   0x84
63 #define EC_POLL                 0xFF
64 #define EC_INTR                 0x00
65 static int acpi_ec_remove(struct acpi_device *device, int type);
66 static int acpi_ec_start(struct acpi_device *device);
67 static int acpi_ec_stop(struct acpi_device *device, int type);
68 static int acpi_ec_intr_add(struct acpi_device *device);
69 static int acpi_ec_poll_add(struct acpi_device *device);
70
71 static struct acpi_driver acpi_ec_driver = {
72         .name = ACPI_EC_DRIVER_NAME,
73         .class = ACPI_EC_CLASS,
74         .ids = ACPI_EC_HID,
75         .ops = {
76                 .add = acpi_ec_intr_add,
77                 .remove = acpi_ec_remove,
78                 .start = acpi_ec_start,
79                 .stop = acpi_ec_stop,
80                 },
81 };
82 union acpi_ec {
83         struct {
84                 u32 mode;
85                 acpi_handle handle;
86                 unsigned long uid;
87                 unsigned long gpe_bit;
88                 struct acpi_generic_address status_addr;
89                 struct acpi_generic_address command_addr;
90                 struct acpi_generic_address data_addr;
91                 unsigned long global_lock;
92         } common;
93
94         struct {
95                 u32 mode;
96                 acpi_handle handle;
97                 unsigned long uid;
98                 unsigned long gpe_bit;
99                 struct acpi_generic_address status_addr;
100                 struct acpi_generic_address command_addr;
101                 struct acpi_generic_address data_addr;
102                 unsigned long global_lock;
103                 unsigned int expect_event;
104                 atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
105                 atomic_t pending_gpe;
106                 struct semaphore sem;
107                 wait_queue_head_t wait;
108         } intr;
109
110         struct {
111                 u32 mode;
112                 acpi_handle handle;
113                 unsigned long uid;
114                 unsigned long gpe_bit;
115                 struct acpi_generic_address status_addr;
116                 struct acpi_generic_address command_addr;
117                 struct acpi_generic_address data_addr;
118                 unsigned long global_lock;
119                 spinlock_t lock;
120         } poll;
121 };
122
123 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
124 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
125 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data);
126 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data);
127 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data);
128 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data);
129 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data);
130 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data);
131 static void acpi_ec_gpe_poll_query(void *ec_cxt);
132 static void acpi_ec_gpe_intr_query(void *ec_cxt);
133 static u32 acpi_ec_gpe_poll_handler(void *data);
134 static u32 acpi_ec_gpe_intr_handler(void *data);
135 static acpi_status __init
136 acpi_fake_ecdt_poll_callback(acpi_handle handle,
137                                 u32 Level, void *context, void **retval);
138
139 static acpi_status __init
140 acpi_fake_ecdt_intr_callback(acpi_handle handle,
141                               u32 Level, void *context, void **retval);
142
143 static int __init acpi_ec_poll_get_real_ecdt(void);
144 static int __init acpi_ec_intr_get_real_ecdt(void);
145 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
146 static union acpi_ec *ec_ecdt;
147
148 /* External interfaces use first EC only, so remember */
149 static struct acpi_device *first_ec;
150 static int acpi_ec_poll_mode = EC_INTR;
151
152 /* --------------------------------------------------------------------------
153                              Transaction Management
154    -------------------------------------------------------------------------- */
155
156 static u32 acpi_ec_read_status(union acpi_ec *ec)
157 {
158         u32 status = 0;
159
160         acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
161         return status;
162 }
163
164 static int acpi_ec_wait(union acpi_ec *ec, u8 event)
165 {
166         if (acpi_ec_poll_mode)
167                 return acpi_ec_poll_wait(ec, event);
168         else
169                 return acpi_ec_intr_wait(ec, event);
170 }
171
172 static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
173 {
174         u32 acpi_ec_status = 0;
175         u32 i = ACPI_EC_UDELAY_COUNT;
176
177         if (!ec)
178                 return -EINVAL;
179
180         /* Poll the EC status register waiting for the event to occur. */
181         switch (event) {
182         case ACPI_EC_EVENT_OBF:
183                 do {
184                         acpi_hw_low_level_read(8, &acpi_ec_status,
185                                                &ec->common.status_addr);
186                         if (acpi_ec_status & ACPI_EC_FLAG_OBF)
187                                 return 0;
188                         udelay(ACPI_EC_UDELAY);
189                 } while (--i > 0);
190                 break;
191         case ACPI_EC_EVENT_IBE:
192                 do {
193                         acpi_hw_low_level_read(8, &acpi_ec_status,
194                                                &ec->common.status_addr);
195                         if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
196                                 return 0;
197                         udelay(ACPI_EC_UDELAY);
198                 } while (--i > 0);
199                 break;
200         default:
201                 return -EINVAL;
202         }
203
204         return -ETIME;
205 }
206 static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
207 {
208         int result = 0;
209
210         ACPI_FUNCTION_TRACE("acpi_ec_wait");
211
212         ec->intr.expect_event = event;
213         smp_mb();
214
215         switch (event) {
216         case ACPI_EC_EVENT_IBE:
217                 if (~acpi_ec_read_status(ec) & event) {
218                         ec->intr.expect_event = 0;
219                         return_VALUE(0);
220                 }
221                 break;
222         default:
223                 break;
224         }
225
226         result = wait_event_timeout(ec->intr.wait,
227                                     !ec->intr.expect_event,
228                                     msecs_to_jiffies(ACPI_EC_DELAY));
229
230         ec->intr.expect_event = 0;
231         smp_mb();
232
233         /*
234          * Verify that the event in question has actually happened by
235          * querying EC status. Do the check even if operation timed-out
236          * to make sure that we did not miss interrupt.
237          */
238         switch (event) {
239         case ACPI_EC_EVENT_OBF:
240                 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
241                         return_VALUE(0);
242                 break;
243
244         case ACPI_EC_EVENT_IBE:
245                 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
246                         return_VALUE(0);
247                 break;
248         }
249
250         return_VALUE(-ETIME);
251 }
252
253 #ifdef ACPI_FUTURE_USAGE
254 /*
255  * Note: samsung nv5000 doesn't work with ec burst mode.
256  * http://bugzilla.kernel.org/show_bug.cgi?id=4980
257  */
258 int acpi_ec_enter_burst_mode(union acpi_ec *ec)
259 {
260         u32 tmp = 0;
261         int status = 0;
262
263         ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
264
265         status = acpi_ec_read_status(ec);
266         if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
267                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
268                 if (status)
269                         goto end;
270                 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
271                                         &ec->common.command_addr);
272                 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
273                 acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
274                 if (tmp != 0x90) {      /* Burst ACK byte */
275                         return_VALUE(-EINVAL);
276                 }
277         }
278
279         atomic_set(&ec->intr.leaving_burst, 0);
280         return_VALUE(0);
281       end:
282         printk(KERN_WARNING PREFIX "Error in acpi_ec_wait\n");
283         return_VALUE(-1);
284 }
285
286 int acpi_ec_leave_burst_mode(union acpi_ec *ec)
287 {
288         int status = 0;
289
290         ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
291
292         status = acpi_ec_read_status(ec);
293         if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
294                 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
295                 if(status)
296                         goto end;
297                 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
298                 acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
299         } 
300         atomic_set(&ec->intr.leaving_burst, 1);
301         return_VALUE(0);
302 end:
303         printk(KERN_WARNING PREFIX "leave burst_mode:error\n");
304         return_VALUE(-1);
305 }
306 #endif /* ACPI_FUTURE_USAGE */
307
308 static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
309 {
310         if (acpi_ec_poll_mode)
311                 return acpi_ec_poll_read(ec, address, data);
312         else
313                 return acpi_ec_intr_read(ec, address, data);
314 }
315 static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
316 {
317         if (acpi_ec_poll_mode)
318                 return acpi_ec_poll_write(ec, address, data);
319         else
320                 return acpi_ec_intr_write(ec, address, data);
321 }
322 static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
323 {
324         acpi_status status = AE_OK;
325         int result = 0;
326         unsigned long flags = 0;
327         u32 glk = 0;
328
329         ACPI_FUNCTION_TRACE("acpi_ec_read");
330
331         if (!ec || !data)
332                 return_VALUE(-EINVAL);
333
334         *data = 0;
335
336         if (ec->common.global_lock) {
337                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
338                 if (ACPI_FAILURE(status))
339                         return_VALUE(-ENODEV);
340         }
341
342         spin_lock_irqsave(&ec->poll.lock, flags);
343
344         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
345                                 &ec->common.command_addr);
346         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
347         if (result)
348                 goto end;
349
350         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
351         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
352         if (result)
353                 goto end;
354
355         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
356
357         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
358                           *data, address));
359
360       end:
361         spin_unlock_irqrestore(&ec->poll.lock, flags);
362
363         if (ec->common.global_lock)
364                 acpi_release_global_lock(glk);
365
366         return_VALUE(result);
367 }
368
369 static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
370 {
371         int result = 0;
372         acpi_status status = AE_OK;
373         unsigned long flags = 0;
374         u32 glk = 0;
375
376         ACPI_FUNCTION_TRACE("acpi_ec_write");
377
378         if (!ec)
379                 return_VALUE(-EINVAL);
380
381         if (ec->common.global_lock) {
382                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
383                 if (ACPI_FAILURE(status))
384                         return_VALUE(-ENODEV);
385         }
386
387         spin_lock_irqsave(&ec->poll.lock, flags);
388
389         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
390                                 &ec->common.command_addr);
391         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
392         if (result)
393                 goto end;
394
395         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
396         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
397         if (result)
398                 goto end;
399
400         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
401         result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
402         if (result)
403                 goto end;
404
405         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
406                           data, address));
407
408       end:
409         spin_unlock_irqrestore(&ec->poll.lock, flags);
410
411         if (ec->common.global_lock)
412                 acpi_release_global_lock(glk);
413
414         return_VALUE(result);
415 }
416
417 static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
418 {
419         int status = 0;
420         u32 glk;
421
422         ACPI_FUNCTION_TRACE("acpi_ec_read");
423
424         if (!ec || !data)
425                 return_VALUE(-EINVAL);
426
427         *data = 0;
428
429         if (ec->common.global_lock) {
430                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
431                 if (ACPI_FAILURE(status))
432                         return_VALUE(-ENODEV);
433         }
434
435         WARN_ON(in_interrupt());
436         down(&ec->intr.sem);
437
438         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
439         if (status) {
440                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
441                 goto end;
442         }
443         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
444                                 &ec->common.command_addr);
445         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
446         if (status) {
447                 printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
448         }
449
450         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
451         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
452         if (status) {
453                 printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
454                 goto end;
455         }
456         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
457         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
458                           *data, address));
459
460       end:
461         up(&ec->intr.sem);
462
463         if (ec->common.global_lock)
464                 acpi_release_global_lock(glk);
465
466         return_VALUE(status);
467 }
468
469 static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
470 {
471         int status = 0;
472         u32 glk;
473
474         ACPI_FUNCTION_TRACE("acpi_ec_write");
475
476         if (!ec)
477                 return_VALUE(-EINVAL);
478
479         if (ec->common.global_lock) {
480                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
481                 if (ACPI_FAILURE(status))
482                         return_VALUE(-ENODEV);
483         }
484
485         WARN_ON(in_interrupt());
486         down(&ec->intr.sem);
487
488         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
489         if (status) {
490                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
491         }
492         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
493                                 &ec->common.command_addr);
494         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
495         if (status) {
496                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
497         }
498
499         acpi_hw_low_level_write(8, address, &ec->common.data_addr);
500         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
501         if (status) {
502                 printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
503         }
504
505         acpi_hw_low_level_write(8, data, &ec->common.data_addr);
506
507         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
508                           data, address));
509
510         up(&ec->intr.sem);
511
512         if (ec->common.global_lock)
513                 acpi_release_global_lock(glk);
514
515         return_VALUE(status);
516 }
517
518 /*
519  * Externally callable EC access functions. For now, assume 1 EC only
520  */
521 int ec_read(u8 addr, u8 * val)
522 {
523         union acpi_ec *ec;
524         int err;
525         u32 temp_data;
526
527         if (!first_ec)
528                 return -ENODEV;
529
530         ec = acpi_driver_data(first_ec);
531
532         err = acpi_ec_read(ec, addr, &temp_data);
533
534         if (!err) {
535                 *val = temp_data;
536                 return 0;
537         } else
538                 return err;
539 }
540
541 EXPORT_SYMBOL(ec_read);
542
543 int ec_write(u8 addr, u8 val)
544 {
545         union acpi_ec *ec;
546         int err;
547
548         if (!first_ec)
549                 return -ENODEV;
550
551         ec = acpi_driver_data(first_ec);
552
553         err = acpi_ec_write(ec, addr, val);
554
555         return err;
556 }
557
558 EXPORT_SYMBOL(ec_write);
559
560 static int acpi_ec_query(union acpi_ec *ec, u32 * data)
561 {
562         if (acpi_ec_poll_mode)
563                 return acpi_ec_poll_query(ec, data);
564         else
565                 return acpi_ec_intr_query(ec, data);
566 }
567 static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
568 {
569         int result = 0;
570         acpi_status status = AE_OK;
571         unsigned long flags = 0;
572         u32 glk = 0;
573
574         ACPI_FUNCTION_TRACE("acpi_ec_query");
575
576         if (!ec || !data)
577                 return_VALUE(-EINVAL);
578
579         *data = 0;
580
581         if (ec->common.global_lock) {
582                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
583                 if (ACPI_FAILURE(status))
584                         return_VALUE(-ENODEV);
585         }
586
587         /*
588          * Query the EC to find out which _Qxx method we need to evaluate.
589          * Note that successful completion of the query causes the ACPI_EC_SCI
590          * bit to be cleared (and thus clearing the interrupt source).
591          */
592         spin_lock_irqsave(&ec->poll.lock, flags);
593
594         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
595                                 &ec->common.command_addr);
596         result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
597         if (result)
598                 goto end;
599
600         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
601         if (!*data)
602                 result = -ENODATA;
603
604       end:
605         spin_unlock_irqrestore(&ec->poll.lock, flags);
606
607         if (ec->common.global_lock)
608                 acpi_release_global_lock(glk);
609
610         return_VALUE(result);
611 }
612 static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
613 {
614         int status = 0;
615         u32 glk;
616
617         ACPI_FUNCTION_TRACE("acpi_ec_query");
618
619         if (!ec || !data)
620                 return_VALUE(-EINVAL);
621         *data = 0;
622
623         if (ec->common.global_lock) {
624                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
625                 if (ACPI_FAILURE(status))
626                         return_VALUE(-ENODEV);
627         }
628
629         down(&ec->intr.sem);
630
631         status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
632         if (status) {
633                 printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
634                 goto end;
635         }
636         /*
637          * Query the EC to find out which _Qxx method we need to evaluate.
638          * Note that successful completion of the query causes the ACPI_EC_SCI
639          * bit to be cleared (and thus clearing the interrupt source).
640          */
641         acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
642                                 &ec->common.command_addr);
643         status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
644         if (status) {
645                 printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
646                 goto end;
647         }
648
649         acpi_hw_low_level_read(8, data, &ec->common.data_addr);
650         if (!*data)
651                 status = -ENODATA;
652
653       end:
654         up(&ec->intr.sem);
655
656         if (ec->common.global_lock)
657                 acpi_release_global_lock(glk);
658
659         return_VALUE(status);
660 }
661
662 /* --------------------------------------------------------------------------
663                                 Event Management
664    -------------------------------------------------------------------------- */
665
666 union acpi_ec_query_data {
667         acpi_handle handle;
668         u8 data;
669 };
670
671 static void acpi_ec_gpe_query(void *ec_cxt)
672 {
673         if (acpi_ec_poll_mode)
674                 acpi_ec_gpe_poll_query(ec_cxt);
675         else
676                 acpi_ec_gpe_intr_query(ec_cxt);
677 }
678
679 static void acpi_ec_gpe_poll_query(void *ec_cxt)
680 {
681         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
682         u32 value = 0;
683         unsigned long flags = 0;
684         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
685         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
686                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
687         };
688
689         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
690
691         if (!ec_cxt)
692                 goto end;
693
694         spin_lock_irqsave(&ec->poll.lock, flags);
695         acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
696         spin_unlock_irqrestore(&ec->poll.lock, flags);
697
698         /* TBD: Implement asynch events!
699          * NOTE: All we care about are EC-SCI's.  Other EC events are
700          * handled via polling (yuck!).  This is because some systems
701          * treat EC-SCIs as level (versus EDGE!) triggered, preventing
702          *  a purely interrupt-driven approach (grumble, grumble).
703          */
704         if (!(value & ACPI_EC_FLAG_SCI))
705                 goto end;
706
707         if (acpi_ec_query(ec, &value))
708                 goto end;
709
710         object_name[2] = hex[((value >> 4) & 0x0F)];
711         object_name[3] = hex[(value & 0x0F)];
712
713         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
714
715         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
716
717       end:
718         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
719 }
720 static void acpi_ec_gpe_intr_query(void *ec_cxt)
721 {
722         union acpi_ec *ec = (union acpi_ec *)ec_cxt;
723         u32 value;
724         int result = -ENODATA;
725         static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
726         const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
727                 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
728         };
729
730         ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
731
732         if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
733                 result = acpi_ec_query(ec, &value);
734
735         if (result)
736                 goto end;
737
738         object_name[2] = hex[((value >> 4) & 0x0F)];
739         object_name[3] = hex[(value & 0x0F)];
740
741         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
742
743         acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
744       end:
745         atomic_dec(&ec->intr.pending_gpe);
746         return;
747 }
748
749 static u32 acpi_ec_gpe_handler(void *data)
750 {
751         if (acpi_ec_poll_mode)
752                 return acpi_ec_gpe_poll_handler(data);
753         else
754                 return acpi_ec_gpe_intr_handler(data);
755 }
756 static u32 acpi_ec_gpe_poll_handler(void *data)
757 {
758         acpi_status status = AE_OK;
759         union acpi_ec *ec = (union acpi_ec *)data;
760
761         if (!ec)
762                 return ACPI_INTERRUPT_NOT_HANDLED;
763
764         acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
765
766         status = acpi_os_execute(OSL_EC_POLL_HANDLER, acpi_ec_gpe_query, ec);
767
768         if (status == AE_OK)
769                 return ACPI_INTERRUPT_HANDLED;
770         else
771                 return ACPI_INTERRUPT_NOT_HANDLED;
772 }
773 static u32 acpi_ec_gpe_intr_handler(void *data)
774 {
775         acpi_status status = AE_OK;
776         u32 value;
777         union acpi_ec *ec = (union acpi_ec *)data;
778
779         if (!ec)
780                 return ACPI_INTERRUPT_NOT_HANDLED;
781
782         acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
783         value = acpi_ec_read_status(ec);
784
785         switch (ec->intr.expect_event) {
786         case ACPI_EC_EVENT_OBF:
787                 if (!(value & ACPI_EC_FLAG_OBF))
788                         break;
789         case ACPI_EC_EVENT_IBE:
790                 if ((value & ACPI_EC_FLAG_IBF))
791                         break;
792                 ec->intr.expect_event = 0;
793                 wake_up(&ec->intr.wait);
794                 return ACPI_INTERRUPT_HANDLED;
795         default:
796                 break;
797         }
798
799         if (value & ACPI_EC_FLAG_SCI) {
800                 atomic_add(1, &ec->intr.pending_gpe);
801                 status = acpi_os_execute(OSL_EC_BURST_HANDLER,
802                                                      acpi_ec_gpe_query, ec);
803                 return status == AE_OK ?
804                     ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
805         }
806         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
807         return status == AE_OK ?
808             ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
809 }
810
811 /* --------------------------------------------------------------------------
812                              Address Space Management
813    -------------------------------------------------------------------------- */
814
815 static acpi_status
816 acpi_ec_space_setup(acpi_handle region_handle,
817                     u32 function, void *handler_context, void **return_context)
818 {
819         /*
820          * The EC object is in the handler context and is needed
821          * when calling the acpi_ec_space_handler.
822          */
823         *return_context = (function != ACPI_REGION_DEACTIVATE) ?
824             handler_context : NULL;
825
826         return AE_OK;
827 }
828
829 static acpi_status
830 acpi_ec_space_handler(u32 function,
831                       acpi_physical_address address,
832                       u32 bit_width,
833                       acpi_integer * value,
834                       void *handler_context, void *region_context)
835 {
836         int result = 0;
837         union acpi_ec *ec = NULL;
838         u64 temp = *value;
839         acpi_integer f_v = 0;
840         int i = 0;
841
842         ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
843
844         if ((address > 0xFF) || !value || !handler_context)
845                 return_VALUE(AE_BAD_PARAMETER);
846
847         if (bit_width != 8 && acpi_strict) {
848                 printk(KERN_WARNING PREFIX
849                        "acpi_ec_space_handler: bit_width should be 8\n");
850                 return_VALUE(AE_BAD_PARAMETER);
851         }
852
853         ec = (union acpi_ec *)handler_context;
854
855       next_byte:
856         switch (function) {
857         case ACPI_READ:
858                 temp = 0;
859                 result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
860                 break;
861         case ACPI_WRITE:
862                 result = acpi_ec_write(ec, (u8) address, (u8) temp);
863                 break;
864         default:
865                 result = -EINVAL;
866                 goto out;
867                 break;
868         }
869
870         bit_width -= 8;
871         if (bit_width) {
872                 if (function == ACPI_READ)
873                         f_v |= temp << 8 * i;
874                 if (function == ACPI_WRITE)
875                         temp >>= 8;
876                 i++;
877                 address++;
878                 goto next_byte;
879         }
880
881         if (function == ACPI_READ) {
882                 f_v |= temp << 8 * i;
883                 *value = f_v;
884         }
885
886       out:
887         switch (result) {
888         case -EINVAL:
889                 return_VALUE(AE_BAD_PARAMETER);
890                 break;
891         case -ENODEV:
892                 return_VALUE(AE_NOT_FOUND);
893                 break;
894         case -ETIME:
895                 return_VALUE(AE_TIME);
896                 break;
897         default:
898                 return_VALUE(AE_OK);
899         }
900 }
901
902 /* --------------------------------------------------------------------------
903                               FS Interface (/proc)
904    -------------------------------------------------------------------------- */
905
906 static struct proc_dir_entry *acpi_ec_dir;
907
908 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
909 {
910         union acpi_ec *ec = (union acpi_ec *)seq->private;
911
912         ACPI_FUNCTION_TRACE("acpi_ec_read_info");
913
914         if (!ec)
915                 goto end;
916
917         seq_printf(seq, "gpe bit:                 0x%02x\n",
918                    (u32) ec->common.gpe_bit);
919         seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
920                    (u32) ec->common.status_addr.address,
921                    (u32) ec->common.data_addr.address);
922         seq_printf(seq, "use global lock:         %s\n",
923                    ec->common.global_lock ? "yes" : "no");
924         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
925
926       end:
927         return_VALUE(0);
928 }
929
930 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
931 {
932         return single_open(file, acpi_ec_read_info, PDE(inode)->data);
933 }
934
935 static struct file_operations acpi_ec_info_ops = {
936         .open = acpi_ec_info_open_fs,
937         .read = seq_read,
938         .llseek = seq_lseek,
939         .release = single_release,
940         .owner = THIS_MODULE,
941 };
942
943 static int acpi_ec_add_fs(struct acpi_device *device)
944 {
945         struct proc_dir_entry *entry = NULL;
946
947         ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
948
949         if (!acpi_device_dir(device)) {
950                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
951                                                      acpi_ec_dir);
952                 if (!acpi_device_dir(device))
953                         return_VALUE(-ENODEV);
954         }
955
956         entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
957                                   acpi_device_dir(device));
958         if (!entry)
959                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
960                                   "Unable to create '%s' fs entry\n",
961                                   ACPI_EC_FILE_INFO));
962         else {
963                 entry->proc_fops = &acpi_ec_info_ops;
964                 entry->data = acpi_driver_data(device);
965                 entry->owner = THIS_MODULE;
966         }
967
968         return_VALUE(0);
969 }
970
971 static int acpi_ec_remove_fs(struct acpi_device *device)
972 {
973         ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
974
975         if (acpi_device_dir(device)) {
976                 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
977                 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
978                 acpi_device_dir(device) = NULL;
979         }
980
981         return_VALUE(0);
982 }
983
984 /* --------------------------------------------------------------------------
985                                Driver Interface
986    -------------------------------------------------------------------------- */
987
988 static int acpi_ec_poll_add(struct acpi_device *device)
989 {
990         int result = 0;
991         acpi_status status = AE_OK;
992         union acpi_ec *ec = NULL;
993
994         ACPI_FUNCTION_TRACE("acpi_ec_add");
995
996         if (!device)
997                 return_VALUE(-EINVAL);
998
999         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1000         if (!ec)
1001                 return_VALUE(-ENOMEM);
1002         memset(ec, 0, sizeof(union acpi_ec));
1003
1004         ec->common.handle = device->handle;
1005         ec->common.uid = -1;
1006         spin_lock_init(&ec->poll.lock);
1007         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1008         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1009         acpi_driver_data(device) = ec;
1010
1011         /* Use the global lock for all EC transactions? */
1012         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1013                               &ec->common.global_lock);
1014
1015         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1016            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1017         if (ec_ecdt) {
1018                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1019                                                   ACPI_ADR_SPACE_EC,
1020                                                   &acpi_ec_space_handler);
1021
1022                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1023                                         &acpi_ec_gpe_handler);
1024
1025                 kfree(ec_ecdt);
1026         }
1027
1028         /* Get GPE bit assignment (EC events). */
1029         /* TODO: Add support for _GPE returning a package */
1030         status =
1031             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1032                                   &ec->common.gpe_bit);
1033         if (ACPI_FAILURE(status)) {
1034                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1035                                   "Error obtaining GPE bit assignment\n"));
1036                 result = -ENODEV;
1037                 goto end;
1038         }
1039
1040         result = acpi_ec_add_fs(device);
1041         if (result)
1042                 goto end;
1043
1044         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
1045                acpi_device_name(device), acpi_device_bid(device),
1046                (u32) ec->common.gpe_bit);
1047
1048         if (!first_ec)
1049                 first_ec = device;
1050
1051       end:
1052         if (result)
1053                 kfree(ec);
1054
1055         return_VALUE(result);
1056 }
1057 static int acpi_ec_intr_add(struct acpi_device *device)
1058 {
1059         int result = 0;
1060         acpi_status status = AE_OK;
1061         union acpi_ec *ec = NULL;
1062
1063         ACPI_FUNCTION_TRACE("acpi_ec_add");
1064
1065         if (!device)
1066                 return_VALUE(-EINVAL);
1067
1068         ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1069         if (!ec)
1070                 return_VALUE(-ENOMEM);
1071         memset(ec, 0, sizeof(union acpi_ec));
1072
1073         ec->common.handle = device->handle;
1074         ec->common.uid = -1;
1075         atomic_set(&ec->intr.pending_gpe, 0);
1076         atomic_set(&ec->intr.leaving_burst, 1);
1077         init_MUTEX(&ec->intr.sem);
1078         init_waitqueue_head(&ec->intr.wait);
1079         strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
1080         strcpy(acpi_device_class(device), ACPI_EC_CLASS);
1081         acpi_driver_data(device) = ec;
1082
1083         /* Use the global lock for all EC transactions? */
1084         acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
1085                               &ec->common.global_lock);
1086
1087         /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
1088            http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
1089         if (ec_ecdt) {
1090                 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
1091                                                   ACPI_ADR_SPACE_EC,
1092                                                   &acpi_ec_space_handler);
1093
1094                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1095                                         &acpi_ec_gpe_handler);
1096
1097                 kfree(ec_ecdt);
1098         }
1099
1100         /* Get GPE bit assignment (EC events). */
1101         /* TODO: Add support for _GPE returning a package */
1102         status =
1103             acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
1104                                   &ec->common.gpe_bit);
1105         if (ACPI_FAILURE(status)) {
1106                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1107                                   "Error obtaining GPE bit assignment\n"));
1108                 result = -ENODEV;
1109                 goto end;
1110         }
1111
1112         result = acpi_ec_add_fs(device);
1113         if (result)
1114                 goto end;
1115
1116         printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
1117                acpi_device_name(device), acpi_device_bid(device),
1118                (u32) ec->common.gpe_bit);
1119
1120         if (!first_ec)
1121                 first_ec = device;
1122
1123       end:
1124         if (result)
1125                 kfree(ec);
1126
1127         return_VALUE(result);
1128 }
1129
1130 static int acpi_ec_remove(struct acpi_device *device, int type)
1131 {
1132         union acpi_ec *ec = NULL;
1133
1134         ACPI_FUNCTION_TRACE("acpi_ec_remove");
1135
1136         if (!device)
1137                 return_VALUE(-EINVAL);
1138
1139         ec = acpi_driver_data(device);
1140
1141         acpi_ec_remove_fs(device);
1142
1143         kfree(ec);
1144
1145         return_VALUE(0);
1146 }
1147
1148 static acpi_status
1149 acpi_ec_io_ports(struct acpi_resource *resource, void *context)
1150 {
1151         union acpi_ec *ec = (union acpi_ec *)context;
1152         struct acpi_generic_address *addr;
1153
1154         if (resource->type != ACPI_RESOURCE_TYPE_IO) {
1155                 return AE_OK;
1156         }
1157
1158         /*
1159          * The first address region returned is the data port, and
1160          * the second address region returned is the status/command
1161          * port.
1162          */
1163         if (ec->common.data_addr.register_bit_width == 0) {
1164                 addr = &ec->common.data_addr;
1165         } else if (ec->common.command_addr.register_bit_width == 0) {
1166                 addr = &ec->common.command_addr;
1167         } else {
1168                 return AE_CTRL_TERMINATE;
1169         }
1170
1171         addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
1172         addr->register_bit_width = 8;
1173         addr->register_bit_offset = 0;
1174         addr->address = resource->data.io.minimum;
1175
1176         return AE_OK;
1177 }
1178
1179 static int acpi_ec_start(struct acpi_device *device)
1180 {
1181         acpi_status status = AE_OK;
1182         union acpi_ec *ec = NULL;
1183
1184         ACPI_FUNCTION_TRACE("acpi_ec_start");
1185
1186         if (!device)
1187                 return_VALUE(-EINVAL);
1188
1189         ec = acpi_driver_data(device);
1190
1191         if (!ec)
1192                 return_VALUE(-EINVAL);
1193
1194         /*
1195          * Get I/O port addresses. Convert to GAS format.
1196          */
1197         status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
1198                                      acpi_ec_io_ports, ec);
1199         if (ACPI_FAILURE(status)
1200             || ec->common.command_addr.register_bit_width == 0) {
1201                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1202                                   "Error getting I/O port addresses"));
1203                 return_VALUE(-ENODEV);
1204         }
1205
1206         ec->common.status_addr = ec->common.command_addr;
1207
1208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
1209                           (u32) ec->common.gpe_bit,
1210                           (u32) ec->common.command_addr.address,
1211                           (u32) ec->common.data_addr.address));
1212
1213         /*
1214          * Install GPE handler
1215          */
1216         status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
1217                                           ACPI_GPE_EDGE_TRIGGERED,
1218                                           &acpi_ec_gpe_handler, ec);
1219         if (ACPI_FAILURE(status)) {
1220                 return_VALUE(-ENODEV);
1221         }
1222         acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1223         acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
1224
1225         status = acpi_install_address_space_handler(ec->common.handle,
1226                                                     ACPI_ADR_SPACE_EC,
1227                                                     &acpi_ec_space_handler,
1228                                                     &acpi_ec_space_setup, ec);
1229         if (ACPI_FAILURE(status)) {
1230                 acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1231                                         &acpi_ec_gpe_handler);
1232                 return_VALUE(-ENODEV);
1233         }
1234
1235         return_VALUE(AE_OK);
1236 }
1237
1238 static int acpi_ec_stop(struct acpi_device *device, int type)
1239 {
1240         acpi_status status = AE_OK;
1241         union acpi_ec *ec = NULL;
1242
1243         ACPI_FUNCTION_TRACE("acpi_ec_stop");
1244
1245         if (!device)
1246                 return_VALUE(-EINVAL);
1247
1248         ec = acpi_driver_data(device);
1249
1250         status = acpi_remove_address_space_handler(ec->common.handle,
1251                                                    ACPI_ADR_SPACE_EC,
1252                                                    &acpi_ec_space_handler);
1253         if (ACPI_FAILURE(status))
1254                 return_VALUE(-ENODEV);
1255
1256         status =
1257             acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
1258                                     &acpi_ec_gpe_handler);
1259         if (ACPI_FAILURE(status))
1260                 return_VALUE(-ENODEV);
1261
1262         return_VALUE(0);
1263 }
1264
1265 static acpi_status __init
1266 acpi_fake_ecdt_callback(acpi_handle handle,
1267                         u32 Level, void *context, void **retval)
1268 {
1269
1270         if (acpi_ec_poll_mode)
1271                 return acpi_fake_ecdt_poll_callback(handle,
1272                                                        Level, context, retval);
1273         else
1274                 return acpi_fake_ecdt_intr_callback(handle,
1275                                                      Level, context, retval);
1276 }
1277
1278 static acpi_status __init
1279 acpi_fake_ecdt_poll_callback(acpi_handle handle,
1280                                 u32 Level, void *context, void **retval)
1281 {
1282         acpi_status status;
1283
1284         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1285                                      acpi_ec_io_ports, ec_ecdt);
1286         if (ACPI_FAILURE(status))
1287                 return status;
1288         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1289
1290         ec_ecdt->common.uid = -1;
1291         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1292
1293         status =
1294             acpi_evaluate_integer(handle, "_GPE", NULL,
1295                                   &ec_ecdt->common.gpe_bit);
1296         if (ACPI_FAILURE(status))
1297                 return status;
1298         spin_lock_init(&ec_ecdt->poll.lock);
1299         ec_ecdt->common.global_lock = TRUE;
1300         ec_ecdt->common.handle = handle;
1301
1302         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1303                (u32) ec_ecdt->common.gpe_bit,
1304                (u32) ec_ecdt->common.command_addr.address,
1305                (u32) ec_ecdt->common.data_addr.address);
1306
1307         return AE_CTRL_TERMINATE;
1308 }
1309
1310 static acpi_status __init
1311 acpi_fake_ecdt_intr_callback(acpi_handle handle,
1312                               u32 Level, void *context, void **retval)
1313 {
1314         acpi_status status;
1315
1316         init_MUTEX(&ec_ecdt->intr.sem);
1317         init_waitqueue_head(&ec_ecdt->intr.wait);
1318         status = acpi_walk_resources(handle, METHOD_NAME__CRS,
1319                                      acpi_ec_io_ports, ec_ecdt);
1320         if (ACPI_FAILURE(status))
1321                 return status;
1322         ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
1323
1324         ec_ecdt->common.uid = -1;
1325         acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
1326
1327         status =
1328             acpi_evaluate_integer(handle, "_GPE", NULL,
1329                                   &ec_ecdt->common.gpe_bit);
1330         if (ACPI_FAILURE(status))
1331                 return status;
1332         ec_ecdt->common.global_lock = TRUE;
1333         ec_ecdt->common.handle = handle;
1334
1335         printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
1336                (u32) ec_ecdt->common.gpe_bit,
1337                (u32) ec_ecdt->common.command_addr.address,
1338                (u32) ec_ecdt->common.data_addr.address);
1339
1340         return AE_CTRL_TERMINATE;
1341 }
1342
1343 /*
1344  * Some BIOS (such as some from Gateway laptops) access EC region very early
1345  * such as in BAT0._INI or EC._INI before an EC device is found and
1346  * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1347  * required, but if EC regison is accessed early, it is required.
1348  * The routine tries to workaround the BIOS bug by pre-scan EC device
1349  * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1350  * op region (since _REG isn't invoked yet). The assumption is true for
1351  * all systems found.
1352  */
1353 static int __init acpi_ec_fake_ecdt(void)
1354 {
1355         acpi_status status;
1356         int ret = 0;
1357
1358         printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1359
1360         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1361         if (!ec_ecdt) {
1362                 ret = -ENOMEM;
1363                 goto error;
1364         }
1365         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1366
1367         status = acpi_get_devices(ACPI_EC_HID,
1368                                   acpi_fake_ecdt_callback, NULL, NULL);
1369         if (ACPI_FAILURE(status)) {
1370                 kfree(ec_ecdt);
1371                 ec_ecdt = NULL;
1372                 ret = -ENODEV;
1373                 goto error;
1374         }
1375         return 0;
1376       error:
1377         printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1378         return ret;
1379 }
1380
1381 static int __init acpi_ec_get_real_ecdt(void)
1382 {
1383         if (acpi_ec_poll_mode)
1384                 return acpi_ec_poll_get_real_ecdt();
1385         else
1386                 return acpi_ec_intr_get_real_ecdt();
1387 }
1388
1389 static int __init acpi_ec_poll_get_real_ecdt(void)
1390 {
1391         acpi_status status;
1392         struct acpi_table_ecdt *ecdt_ptr;
1393
1394         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1395                                          (struct acpi_table_header **)
1396                                          &ecdt_ptr);
1397         if (ACPI_FAILURE(status))
1398                 return -ENODEV;
1399
1400         printk(KERN_INFO PREFIX "Found ECDT\n");
1401
1402         /*
1403          * Generate a temporary ec context to use until the namespace is scanned
1404          */
1405         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1406         if (!ec_ecdt)
1407                 return -ENOMEM;
1408         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1409
1410         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1411         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1412         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1413         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1414         spin_lock_init(&ec_ecdt->poll.lock);
1415         /* use the GL just to be safe */
1416         ec_ecdt->common.global_lock = TRUE;
1417         ec_ecdt->common.uid = ecdt_ptr->uid;
1418
1419         status =
1420             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1421         if (ACPI_FAILURE(status)) {
1422                 goto error;
1423         }
1424
1425         return 0;
1426       error:
1427         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1428         kfree(ec_ecdt);
1429         ec_ecdt = NULL;
1430
1431         return -ENODEV;
1432 }
1433
1434 static int __init acpi_ec_intr_get_real_ecdt(void)
1435 {
1436         acpi_status status;
1437         struct acpi_table_ecdt *ecdt_ptr;
1438
1439         status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1440                                          (struct acpi_table_header **)
1441                                          &ecdt_ptr);
1442         if (ACPI_FAILURE(status))
1443                 return -ENODEV;
1444
1445         printk(KERN_INFO PREFIX "Found ECDT\n");
1446
1447         /*
1448          * Generate a temporary ec context to use until the namespace is scanned
1449          */
1450         ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
1451         if (!ec_ecdt)
1452                 return -ENOMEM;
1453         memset(ec_ecdt, 0, sizeof(union acpi_ec));
1454
1455         init_MUTEX(&ec_ecdt->intr.sem);
1456         init_waitqueue_head(&ec_ecdt->intr.wait);
1457         ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
1458         ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
1459         ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
1460         ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1461         /* use the GL just to be safe */
1462         ec_ecdt->common.global_lock = TRUE;
1463         ec_ecdt->common.uid = ecdt_ptr->uid;
1464
1465         status =
1466             acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
1467         if (ACPI_FAILURE(status)) {
1468                 goto error;
1469         }
1470
1471         return 0;
1472       error:
1473         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1474         kfree(ec_ecdt);
1475         ec_ecdt = NULL;
1476
1477         return -ENODEV;
1478 }
1479
1480 static int __initdata acpi_fake_ecdt_enabled;
1481 int __init acpi_ec_ecdt_probe(void)
1482 {
1483         acpi_status status;
1484         int ret;
1485
1486         ret = acpi_ec_get_real_ecdt();
1487         /* Try to make a fake ECDT */
1488         if (ret && acpi_fake_ecdt_enabled) {
1489                 ret = acpi_ec_fake_ecdt();
1490         }
1491
1492         if (ret)
1493                 return 0;
1494
1495         /*
1496          * Install GPE handler
1497          */
1498         status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1499                                           ACPI_GPE_EDGE_TRIGGERED,
1500                                           &acpi_ec_gpe_handler, ec_ecdt);
1501         if (ACPI_FAILURE(status)) {
1502                 goto error;
1503         }
1504         acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1505         acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);
1506
1507         status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
1508                                                     ACPI_ADR_SPACE_EC,
1509                                                     &acpi_ec_space_handler,
1510                                                     &acpi_ec_space_setup,
1511                                                     ec_ecdt);
1512         if (ACPI_FAILURE(status)) {
1513                 acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
1514                                         &acpi_ec_gpe_handler);
1515                 goto error;
1516         }
1517
1518         return 0;
1519
1520       error:
1521         printk(KERN_ERR PREFIX "Could not use ECDT\n");
1522         kfree(ec_ecdt);
1523         ec_ecdt = NULL;
1524
1525         return -ENODEV;
1526 }
1527
1528 static int __init acpi_ec_init(void)
1529 {
1530         int result = 0;
1531
1532         ACPI_FUNCTION_TRACE("acpi_ec_init");
1533
1534         if (acpi_disabled)
1535                 return_VALUE(0);
1536
1537         acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1538         if (!acpi_ec_dir)
1539                 return_VALUE(-ENODEV);
1540
1541         /* Now register the driver for the EC */
1542         result = acpi_bus_register_driver(&acpi_ec_driver);
1543         if (result < 0) {
1544                 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1545                 return_VALUE(-ENODEV);
1546         }
1547
1548         return_VALUE(result);
1549 }
1550
1551 subsys_initcall(acpi_ec_init);
1552
1553 /* EC driver currently not unloadable */
1554 #if 0
1555 static void __exit acpi_ec_exit(void)
1556 {
1557         ACPI_FUNCTION_TRACE("acpi_ec_exit");
1558
1559         acpi_bus_unregister_driver(&acpi_ec_driver);
1560
1561         remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1562
1563         return_VOID;
1564 }
1565 #endif                          /* 0 */
1566
1567 static int __init acpi_fake_ecdt_setup(char *str)
1568 {
1569         acpi_fake_ecdt_enabled = 1;
1570         return 1;
1571 }
1572
1573 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1574 static int __init acpi_ec_set_intr_mode(char *str)
1575 {
1576         int intr;
1577
1578         if (!get_option(&str, &intr))
1579                 return 0;
1580
1581         if (intr) {
1582                 acpi_ec_poll_mode = EC_INTR;
1583                 acpi_ec_driver.ops.add = acpi_ec_intr_add;
1584         } else {
1585                 acpi_ec_poll_mode = EC_POLL;
1586                 acpi_ec_driver.ops.add = acpi_ec_poll_add;
1587         }
1588         printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
1589         return 1;
1590 }
1591
1592 __setup("ec_intr=", acpi_ec_set_intr_mode);